In a certain region of space, the electric field is zero. From this fact, what can you conclude about the electric potential in this region?
1.It is zero.
2.It is constant.
3.It is positive.
4.It is negative.
5.None of these answers is necessarily true.
2
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Optics of the Eye: A person's near point is 25 cm, and her eye lens is 2.7 cm away from the retina. What must be the focal length of this lens for an object at the near point of the eye to focus on the retina?
A. -3.4 cm B. -2.4 cm C. 2.4 cm D. 3.4 cm E. 2.6 cm
A 2500 kg car accelerates from rest to a velocity of 10 m/s in 5.0 seconds. The power of the engine during this acceleration is
A. 50 kW. B. 47 kW. C. 40 kW. D. 31 kW. E. 25 kW.
Impedance: What is the impedance at 1500 Hz if a 100-? resistor, 20-mH coil, and 1.0-?F capacitor are connected in series?
A. 0.19 k? B. 0.13 k? C. 0.11 k? D. 82 ?
As the frequency of the ac voltage across a capacitor approaches zero, the capacitive reactance of that capacitor
A) approaches zero. B) approaches infinity. C) approaches unity. D) none of the given answers